\(A=2^2+2^2+2^3+2^4+...+2^{2015}+2^{2016}\)
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\(2A=2+2^2+2^3+2^4+...+2^{2017}\)
\(A=2A-A=2^{2017}-1\)
=> \(A+1=2^{2017}-1+1=2^{2017}\)
Ta có: A=1+2+22+23+24+…+2200
=>2A=2+22+23+24+25+…+2201
=>2A-A=2+22+23+24+25+…+2201-1-2-22-23-24-…-2200
=>A=2201-1
=>A+1=2201
Ta có: A=1+2+22+23+24+…+2200
=>2A=2+22+23+24+25+…+2201
=>2A-A=2+22+23+24+25+…+2201-1-2-22-23-24-…-2200
=>A=2201-1
=>A+1=2201
2A = 2 + 2^2+ 2^3+...+2^101
2A-A = 2^101- 1
=> A = 2^101- 1
=> A + 1 = 2^101
Ta có: A = 1 + 2 + 22 + 23 + ....... + 2200
=> 2A = 2 + 22 + 23 + ....... + 2201
=> 2A - A = ( 2 + 22 + 23 + ....... + 2201 ) - ( 1 + 2 + 22 + 23 + ....... + 2200 )
=> A = 2201 - 1
=> A + 1 = 2201
A = 1 + 2 + 2 ^ 2 + 2 ^ 3 + ... + 2 ^ 200
2A = 2 + 2 ^ 2 + 2 ^ 3 + 2 ^ 4 + ... + 2 ^ 201
2A - A = ( 2 + 2 ^ 2 + 2 ^ 3 + 2 ^ 4 + ... + 2 ^ 201 )
- ( 1 + 2 + 2 ^ 2 + 2 ^ 3 + ... + 2 ^ 200 )
A = 2 ^ 201 - 1
=> A + 1 = 2 ^ 201
B = 3 + 3 ^ 2 + 3 ^ 3 + ... + 3 ^ 2005
3B = 3 ^ 2 + 3 ^ 3 + 3 ^ 4 + ... + 3 ^ 2006
3B - B = ( 3 ^ 2 + 3 ^ 3 + 3 ^ 4 + ... + 3 ^ 2006 )
- ( 3 + 3 ^ 2 + 3 ^ 3 + ... + 3 ^ 2005 )
2B = 3 ^ 2006 - 3
=> 2B = 3 ^ 2006
Vậy 2B + 3 là lũy thừa của 3
\(2A=2+2^2+2^3+...+2^{201}\)
\(2A-A=\left(2+2^2+...+2^{201}\right)-\left(1+2+...+2^{200}\right)\)
\(A=2^{201}-1\)
\(A+1=2^{201}-1+1\)
\(A+1=2^{201}\)
\(A=2+2^2+2^3+...+2^{99}+2^{100}\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{100}+2^{101}\)
\(\Rightarrow A=2^{101}-2\)
\(\Rightarrow A+2=2^{101}-2+2\)
\(\Rightarrow A+2=2^{101}\)
\(A=2+2^2+2^3+...+2^{100}\)
\(\Rightarrow2A=2.\left(2+2^2+2^3+...+2^{100}\right)\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{101}\)
\(\Rightarrow2A-A=\left(2^2+2^3+2^4+...+2^{101}\right)-\left(2+2^2+2^3+...+2^{100}\right)\)
\(\Rightarrow A=2^{101}-2\)
\(\Rightarrow A+1=2^{101}-2+2\)
\(\Rightarrow A+2=2^{101}\)
Vậy A+2=2101
2A = 2 + 22 + 23 + ... + 2201
A = 2A - A = 2 + 22 + 23 + ... + 2201 - ( 1 + 2 + 22 + 23 + ... + 2200 )
= 2 + 22 + 23 + ... + 2201 - 1 - 2 - 22 - 23 - ... - 2200 = 2201 - 1
=> A + 1 = 2201 - 1 + 1 = 2201
A = 1 + 2^1 + 2^2 + 2^3 + ... + 2^2015
2A = 2^1 + 2^2 + 2^3 + ... + 2^2015 + 2^2016
2A - A = 2^2016 - 1
A = (2^3)^2016 - 1
A + 1 = 8^2016
Vậy A + 1 = 8^2016
Bg
Ta có: A = 1 + 21 + 22 + 23 +...+ 22015
=> 2A = 2.(1 + 21 + 22 + 23 +...+ 22015)
=> 2A = 2 + 22 + 23 + 24 +...+ 22016
=> 2A - A = (2 + 22 + 23 + 24 +...+ 22016) - (1 + 21 + 22 + 23 +...+ 22015)
=> A = 22016 - 1
=> A + 1 = 22016 - 1 + 1
=> A + 1 = 22016
=> A + 1 = 23.672
=> A + 1 = (23)672
=> A + 1 = 8672
A = 22+(22+23+24+...+22015+22016)
2A = 23+(23+24+25+...+22016+22017)
2A - A = A = 23[+(23+24+25+...+22016+22017)] - [22+(22+23+24+...+22015+22016)]
A = 23+23+24+25+...+22016+22017-22-22-23-24-...-22015-22016 = 22017-22-22+23 (DÙNG PHƯƠNG PHÁP LƯỢC BỎ)
A = 22017-(22+22-23)
A = 22017-(4+4-8)
A = 22017-0 = 22017
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